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  • The product equals "tenant" in BFE, which has its own configuration, such as forwarding policies, permission, etc.


  • A Cluster means a set of backend servers which provide the same functionality. Multiple clusters can be defined within a product.
  • Usually,a cluster may span multiple IDC.

Sub Cluster

  • A cluster may be composed of multiple sub clusters conceptually.
  • Usually, backend servers within the same IDC are defined as a sub cluster.


  • A sub cluster contains multiple instances (i.e. backend servers).
  • Each instance is identified by IP address and port.